Arkansas nurse aide certificates are valid for a twenty-four month period. To prevent a certificate from expiring one needs to apply for renewal before the expiration date. Renewal is only possible if you worked as a nurse aide, for pay, for at least eight hours within the previous certification period. If you are currently working as a nurse aide then you qualify for re-certification for twenty-four months. A nurse aide who is not currently working as a CNA will be re-certified for two years beginning with the last day he or she worked.